In the following probability problems, problems #1-3 function as a set, problems #4-5 are another set, and problems #6-7 are yet another set. The scenarios are all similar in a set, and the answer choices for those problems in the same set are the same. What is going on there? Do all questions in the […]

# Archive | Probability

## GMAT Data Sufficiency Practice Questions on Probability

First off, some of my previous blogs that may be relevant: 1) Data Sufficiency Tips 2) Probability Rules 3) The probability of the “at least” scenario 4) Probability problems involving counting Here are eight practice questions. Solutions will appear at the end of the article. 1) In nine independent trials, what is the probability that […]

## GMAT Probability Questions

Here is a set of 14 GMAT probability questions, all in the Problem Solving style on the test, collected from a series of blog articles. Answers and links to explanations to these these GMAT probability problems are at the end of set. —————————————————————————————————————————————— The scenario below is relevant to questions #1-#3. There are two sets […]

## Geometric Probability on the GMAT

In the first three articles in this series on GMAT probability questions, I discussed the AND and OR probability rules, “at least” probability questions, and probability questions that involve counting. This post covers relatively rare kind of probability question not covered in the first three posts: geometric probability questions. First, a few challenging practice GMAT […]

## GMAT Probability and Counting Techniques

This is the third in a series of probability articles for the GMAT Quantitative Section. In the first, I discussed the “AND” and “OR” rules for probability. In the second, I discussed the “complement rule” and how to use this to solve “at least” problems in probability. For a warm-up, here are some challenging GMAT […]

## GMAT Math: the Probability “At Least” Question

In the first post in this series, I spoke about the AND rule and the OR rule in probability. Now, we will focus on probability question involve the words “at least.” First, some practice of this genre. Set #1 = {A, B, C, D, E} Set #2 = {K, L, M, N, O, P} 1) […]

## GMAT Math: Probability Rules

First, some practice questions. The scenario below is relevant to questions #1-#3. There are two sets of letters, and you are going to pick exactly one letter from each set. Set #1 = {A, B, C, D, E} Set #2 = {K, L, M, N, O, P} 1) What is the probability of picking a […]

## Breakdown of GMAT Quant Concepts by Frequency

Magoosh’s very own Mike McGarry, GMAT/Math Teacher/Tutor/Foosball player extraordinaire, went through 5 different sets of Official GMAT Practice Material and tallied questions based on the subject material they tested to find the most common GMAT questions. Here are the samples of Official Material he used to figure out the GMAT Quant breakdown: 1.GMAT Official Guide […]

## GMAT Probability: Difficult Dice Questions

Dice problems aren’t too common on the GMAT. As for the exact probability of getting a dice problem is something only privy to those over at GMAC. While it is a good idea to know your dice basics, doing so will only help you in the case of an easy dice problem. And one thing […]